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Acquisition and Divestitures (Narrative) (Details) $ in Millions, $ in Billions |  |  | 3 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 07, 2021 shares | Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Mar. 30, 2022 USD ($) | Mar. 31, 2021 USD ($) MMBoe | Jun. 30, 2020 USD ($) | Jun. 30, 2020 CAD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Dec. 31, 2021 USD ($) MMBoe | Dec. 31, 2020 USD ($) MMBoe | Dec. 31, 2019 USD ($) MMBoe | Dec. 31, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  |  |  |  |  |  | $ 66 | $ 38 |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  |  | $ (1) | $ 222 |
Total estimated proved reserves | MMBoe | [1] |  |  |  |  |  |  |  |  | 7 | 2 | 54 |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  | $ 168 | $ 1 | $ 48 |
Gain loss on disposition of assets |  |  |  |  |  |  |  |  |  | 168 | $ 1 | 48 |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  | $ 490 |  |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  | 110 |  |  |
Contingent earnout payments |  |  | 65 |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  | $ 490 |  |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  | 110 |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  |  | 2.75 |  |  |  |  |  |  |  |  |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  |  | 50 |  |  |  |  |  |  |  |  |  |
Gain loss on disposition of assets |  |  |  |  |  |  |  |  |  | 110 |  |  |
Barnett Shale [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  |  |  | The contingent payment period commenced on January 1, 2021 and has a term of four years.
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  | $ 223 |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  |  | 2,600 | $ 3.4 |  |  |  |
Gain recognized on sale of business, net of tax |  |  |  |  |  |  |  | $ 425 |  |  |  |  |
Canadian Business Segment [Member] | Canadian Natural Resources Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  |  |  | 223 |
Proceeds from sale of business |  |  |  |  |  | $ 2,600 | $ 3.4 |  |  |  |  |  |
Gain recognized on sale of business, net of tax |  |  |  |  |  |  |  |  |  |  |  | 425 |
Other Current Assets | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  |  | 65 |  |  |
Other Noncurrent Assets | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  |  | $ 111 |  |  |
Non Core Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  |  |  | $ 9 |  |  |  |  |  |  | $ 390 |
Gain on asset dispositions |  |  |  |  | $ 35 |  |  |  |  |  |  |  |
Total estimated proved reserves | MMBoe |  |  |  |  | 3 |  |  |  |  |  |  | 54 |
Contingent earnout payments |  |  |  | $ 4 |  |  |  |  |  |  |  |  |
Change in contingent earnout payments |  |  |  | $ 4 |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  |  |  | $ 9 |  |  |  |  |  |  | $ 390 |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  |  |  | 48 |
Gain loss on disposition of assets |  |  |  |  |  |  |  |  |  |  |  | $ 48 |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Date of agreement |  | Jan. 07, 2021 |  |  |  |  |  |  |  | Jan. 07, 2021 |  |  |
Per share conversion | shares |  | 0.5165 |  |  |  |  |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  |  |  |  |  |  | $ 5,400 |  |  |
[1] | Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.

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